Warp stop-motion for looms.



A. H. SAWTELL. WARP STOP MOTION FOR LOOMS.

APPLICATION FILED MAR.29| 1915.

LYYQGBL V Patented-Feb. 8,1916.

Imwemiar:

ALBERT H. SAWTELL, F WINTHROP, MASSACHUSETTS.

WARP STOP MOTI ON FOR LOOMS.

To all whom it may concern} Be it known that I, ALBERT H. SAWTELL, a citizen of the United States, and a resident of Winthrop, in the county of Suffolk and broad loom having my invention applied thereto; Fig. 2 is a detail showing one of the loom cross braces; Fig. 3 is a plan view upon a large scale illustrating the preferred arrangement of drops; and Fig. 4 is a view partially in side elevation and partially in vertical section illustrating the preferred arrangement of drops.

So far as I am aware,'drop wires have not been successfully used upon broad looms and particularly because of the fact that the cross brace or cross braces thereof are so positioned as to interfere with the indicating movement of the drops.

An important object of my invention is to provide a Warp stop motion peculiarly adapted for use in broad looms for weaving silk or worsted goods, though within the scope of the invention the drop mechanism may be used in other relations and in other types of looms than broad looms.

My warp stop mechanism is peculiarly adapted for use in conjunction with electrical means for stopping looms, but within the broad scope and purpose thereof, it may be used in connection with mechanical means for such purpose.

Referring more particularly to the drawing, I have therein indicated one side frame of the loom at 1, it being of any suitable construction. The warp 2 is let off from the usual warp beam not herein shown and passes over a whip roll 3, the woven cloth being accumulated upon the take-up roll, not shown, in any suitable manner. I have indicated at 4 a shed formed in the warp. Preferably and in this embodiment of the Specification of Letters Patent.

invention between said shed and the whip roll 3, I position the drops which are there- Patented Feb. 8, 19118. Application filed March 29 1915. Serial No. 17,631.

fore herein shown as supported upon the warp ends at a point where they are not affected by the shedding movement. The loom is provided with one or more crossbraces 5 secured in any suitable manner to the frame of the loom, and preferably to a center piece '6, as by bolts indicated at 7. One of these cross braces is indicated in detail in Fig. 2.

At opposite sides of the loom, I provide two brackets 8 adapted to be secured at the proper height by means of bolts 9 passing through slots or elongated openings 10.

Preferably each bracket 8 is thus adjustably secured to a lower bracket 11 itself secured to the adjacent member of the loom frame by bolts 12. Preferably adjacent the upper edge of the bracket 8 I provide guides 13 extending from side to side of the loom and from which the warp ends pass and whereon they are sup-ported as indicated in Figs. 1, 3 and 4. Said warp ends are thus supported in non-leased condition upon said brackets 8, and therefore extend in a horizontal path as indicated in said figures. I

provide for a suitable number of banks of drop devices. In the disclosed form of my invention, I have represented four such banks. More or fewer may be employed. I Referring particularly to the preferred and selected embodiment of my invention, I have herein represented four guide bars 14, 15, 16, 17 whereon are supported in suitable projections 18, 19, 20, 21 extending from the brackets 8, sets of drops 22, 23, 24, 25, each of which preferably has an open ended slot 26 which may be enlarged at the upper for the reception of the proper warp end 2. Preferably but not necessarily the warp stop motion herein disclosed is of the electrical type in which case the guide bars 14, 15, 16 and 17 constitute one terminal. I have herein represented each drop as provided with lateral shoulders 28, 29, with which cooperate stop rods or other devices 30 located over said shoulders, so as to prevent the drop-s from being unduly lifted because of the movement of the warp ends.

Each drop is preferably provided with two shoulders, so that the drops may be reversed in position if desired. If as preferred the warp stop be an electrical one, the guide bars 14, 15, 16, 17, constituting one end as indicated at 27 metal, are very apt terminal, are suitably connected to conductors 31 leading to an electro-magnet 32 which is energized upon completion of the circuit.

My experiments have demonstrated that drop wires, being of exceedingly thin sheet to twist when they drop into indicating position, and-in such manner as to interfere with their most effective op- 'eration.

After much experimentation, I have ascertained that this defect may be fully overcome by so shaping or constructing the lower end portions of the said drops as to embrace or partially surround in their fallen or indicating position the co-acting stop member which, in the case of an electrical warp stop mechanism constitutes the in cross section, and theyare herein represented as circular. Whatever be their cross sectional shape, I correspondingly shape the lower ends of the drops 22, 23, 24, 25, which are shown as recessed or concaved at 38.

The" construction and relation of the parts is such that the concaved lower end 38 of a fallen drop fits snugly upon the bar 33, 34, 35, 36 therebeneath, and in such manner that by reason of said engagement and the supporting bar 14, 15, 16, 17, the drop is held firmly and without twisting.

The length of the drops is such that even in their indicating position, they are above and out of contact with the members or cross braces 5, as is most clearly evident from the position of the indicating dro in Fig. 1.

In Fig. 3, I have indicated our warp ends a, 5, 0,61, whereon are respectively supported the drop devices 22, 23, 24, 25, the arrangement of said devices depending upon the number of banks thereof. While the drop devices indicated may be of different sizes, within the scope of my invention, I have, in

Fig. 4, represented them as of the full or actual size preferred in practice. From the construction I and arrangement of parts therein represented, it will be evident'that an indicatin drop will fall but a very short distance be ore the recessed lower end 38 comes in contact with the terminal bar 33, 34, 35, 36, and that in its indicating position, it will be out of contact with the cross brace 5. Thus, my warp stop mechanism eculiarly cooperates with a loom provide with a cross brace.

Because of the preferrednon-leased arrangement of thewarp ends, the drop devices are supported at a higher position than would be the case with leased warps, the construction and arrangement whereof are disclosed in the patent to 'Coldwell and Gildard, Reissue No. 11,923, dated July 31, 1901.

Having thus described one illustrative embodiment of my invention, I desire it to be understood that although specific terms are employed, they are used in a generic and descriptive sense and not for purposes of limitation, the scope of the invention being set forth in the following claims.

Claims:

1. A warp stop motion for looms comprising in combination, means to support a set of warp ends, a set of forked drop devices supported thereon, a stop member whereon said set of drop devices is mounted, and a co-acting stop member consisting of a rod substantially circular in cross section and mounted below said drop devices, and spaced and distinct from said stop member, the lower ends of the drop devices being concaved to fit upon said co-acting stop rod when in indicating position.

2. A Warp stop motion for looms comprising in combination, means to support a set of warp ends, a set of forked drop devices supported-thereon, each drop device having a lateral shoulder or shoulders, stop devices above said lateral shoulders but below the warp ends, a stop member whereon said d'rop devices are mounted, and a co-acting stop member mounted below said drop devices and spaced and distinct from said stop member, the lower ends of the drop devices being recessed to fit upon said co-acting stop member when in indicating position.

3. In a broad loom having a cross brace connected to the loom frame beneath and in proximity to stop devices, means to support a set of warp ends in non-leased condition, sets of short drop devices supported on said non-leased portions of said warp ends with their upper ends in substantially the same plane, a series .of'stop members whereon said drop devices are mounted in sets, and a series of co-acting stop members mounted below drop devices but above said cross brace, and spaced and distinct from said series of stop members, the lower ends of said drop devices being shaped to fit upon said respective co-acting stop members when in indicating position, said parts being so relatively located that a drop in indicatingposition and in contact with the co-acting stop member is out of contact with said cross brace.

4. In a broad loom having a cross brace connected to the loom frame beneath and in proximity to stop devices, means to support a set of warp ends in non-leased condition, sets of short drop devices supported on said non-leased portions of said warp contact with the respective rod is out of contact with said cross brace.

5. In a broad loom having a cross brace connected to the loom frame beneath and in proximity to stop devices, means to support a set of warp ends in non-leased convdition, sets of short drop devices supported on said non-leased portions of said warp ends with their upper ends in substantially the same plane, a series of electrical contact rods upon which said drop devices are supported, and a co-acting series of electrical contact rods mounted below said drop devices but above said cross brace, the lower.

ends of said drop devices being shaped to embrace said lower rods when in indlcating position, said parts being so relatively located that a drop in indicating position and in contact with its said rod is out of contact with said cross brace.

6. A warp stop motion for looms comprising in combination, a cross brace 5 connected to the loom frame beneath and in proximity to stop-devices, means to sup ort a set of warp ends, a set of drop devices 22 slotted at 26 and supported upon said warp ends, a stop member'14 whereon said set of short drop devices is mounted and a coacting stop member 33 mounted below said drop devices spaced and distinct from said stop member, but above the said cross brace 5 of the loom, the lower ends-of the said drop devices being recessed at 38 to fit upon said coacting stop member 33 when in indicating position.

7. In abroad loom having a cross brace connected to the loom frame beneath and in proximity to stop devices, means to support a set of warp ends in non-leased condition, sets of short drop devices supported on said non-leased portions of said warp ends and stopping means with which an indicating drop contacts, said stopping means being positioned above said cross brace and in such position relative thereto that a drop in indicating position and in contact with said stop means is out of contact with said cross brace.

8. In a broad loom having a cross brace connected to the loom frame beneath and in proximity to stop devices, means to support a set of warp ends in non-leased condition, sets of short drop devices supported on said non-leased portions of said warp ends, a series of stop members whereon said drop devices are mounted in sets, and a series of co-acting stop members mounted below said drop devices but above said cross brace and spaced and distinct from said series of stop members, said parts being so relatively located that a drop in indicating position and in contact with the co-acting stop member is out of contact with said cross brace.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribin witnesses.

iLBERT H. SAW'IELL. Witnesses:

ROBERT H. KAMMLER, F. IRENE CHANDLER. 

